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Civil Engineering Objective Questions { Environmental Engineering }



344.  Consider the following statements regarding the self cleansing velocity in the sewers: 1. For the removal of the inorganic sand particles of diameter 1 mm and specific gravity 2.65, 0.45 m/sec velocity is required 2. For the removal of organic particles of 5 mm diameter and specific gravity 1.2,0.45 in/sec velocity is required 3. For the removal of inorganic sand particles 1 mm dia and organic particles 5 mm dia with respective specific gravity 2.65 and 1.2,0.30 m/sec velocity is required Of these statements:
A. 1 alone is correct
B. 1 and 2 are correct
C. 1 and 3 are correct
D. 2 and 3 are correct
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345. According to National Building Organisation (N.B.O.) of India, gradients for preventing interference of sewage solids in small sized sewers are : 1.Dia. of the sewer (mm)2. Gradient for self cleansing velocity Of these statements:
A. 1 alone is correct
B. 2 alone is correct
C. 1 and 2 are correct
D. 1, 2 and 3 are correct
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346. Consider the following statements regarding the sewers 1. Manholes are generally provided in plane areas 2. Drop man holes are generally required in hilly areas 3. Lamp holes are generally provided at the bend of the sewer Of these statements: (a) 1 alone is correct
A. 1 alone is correct
B. 2 alone is correct
C. 1 and 3 are correct
D. 1, 2 and 3 are correct
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347.  Consider the following specification need be checked while designing the sewers 1. The minimum velocity of 0.45 m/sec is maintained at the 1/3rd of sewage flow 2. The velocity of 0.9 m/sec should be at least at the time of maximum flow 3. At the time of maximum flow, the velocity should not exceed the scouring values. Of these statements:
A. 1 alone is correct
B. 1 and 2 are correct
C. 2 and 3 are correct
D. 1, 2 and 3 are correct
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348. Consider the following statements regarding flow in circular sewers A. The decline in proportionate velocities is less as compared to the decline in discharge in sewers running less than half the full depth R. The area reduces much faster than the hydraulic mean depth. Of these statements:
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true.
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349. Consider the following statements regarding the circular sewers 1. These require highly technical method of manufacturing 2. These provide maximum area for a given perimeter 3. These provide most efficient section when running full or half full Of these statements:
A. 1 alone is correct
B. 2 alone is correct
C. 1 and 2 are correct
D. 1, 2 and 3 are correct
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350. Consider the following statements regarding the asbestos cement sewers 1. Light in weight and easy to transport 2. Easy assembly without skilled labour 3. The interior surface is very smooth 4. Ability to bear the large compressive stresses induced by the heavy external loads Of these statements:
A. 1 alone is correct
B.1 and 3 are correct
C. 1, 2 and 3 are correct
D. 1, 2, 3 and 4 are correct
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